Grate for boiler-furnaces, &amp;c.



' PHILIP S. SPILLER,

UNITED STATPHSIPATENT OFFICE.

or AUSTIN, TExA liSSIeNoI-t or ONE-HALF TO NELSON 0. BRENIZER, or AUSTIN, TEXAS.

GRATE FOR BOILER-FURNACES, 800.

N0. 845,590. Specification of Letters Patent. Patented Feb. 26, 1907. Application filed October 23,1905. Serial No. 284,119. To all whom it may concern: ed by nipples b with an ordinary Y, (desig- Be it known that I, PHILIP S. SPILLER, a I citizen of the United States, residing at Austin, in the county of Travis and State of I Texas, have made certain new and useful Tml provements in Grates for Boiler-Furnaces, &c., of which the following is a specification.

My invention relates to an improvement in grate-bars for steam-boiler furnaces, stoves, or any fire where soft coal, lignite, or any other fuel is used which throws off carbon, its object being to produce a higher degree of heat than is obtained by the usual grate-b ars.

My invention consists in certain novel features of construction, arrangement, and combination of parts, as will be hereinafter fully described, and pointed out in the claims, reference being had to the accompanying drawings, in which- Figure 1 is a side elevation of an ordinary boiler-furnace with a portion of the side wall of the fire-box removed, Showing my improvements in place. Fig. 2 is a horizontal section of same on line 2 2 of Fig. 1. Fig. 3 is an enlarged sectional detail view looking toward the rear. Fig. 4 is a detail plan view, partly in section, of the rear ends of two grate-bars and their rear end connections.

A represents an ordinary boiler provided with the steam-dome A B is a pipe leading from the steam-dome downwardly at the Side of fire to near its bot tom, said pipe being provided with a stopcock I), as shown. Said pipe is bent at its lower end and continues horizontally along the outside of the fire-box to the front thereof, extending slightly in advance of the front of the fire-box, and is then carried across the front of the fire-box C to about the center of the same, thence passing into the fire-box C through the front wall thereof. Pipe B is then carried two or more times around the inside of the fire-box near its walls and at the front center of the fire-box is connected to a short vertical pipe B.

D represents hollow grate-bars made in nated in Fig. 3 as F,) and to the lower end of this Y is connected the lower end of pipe B. Through theupper side walls of each hollow grate-bar are drilled perforations (1 which extend diagonally upward from the inside to the outside of said bars. (1 are placed at regular intervals along each bar, but the perforations are placed staggered or alternate with those of the adjacent bar. All of the hollow bars are-connected at the rear with hollow cross-bar E, which will be practically of the same dimensions as said grate-bars, though the grate may be and usually will be made in two sections to facilitate installation of the same. Now it will be seen that steam from dome A passing through pipe B, which is coiled around the fire-box above the grate, will be superheated and, passing into the hollow grate-bars, will be discharged from them through the perforations (1 drawing the air which is admitted through the space between the grate-bars and combining product which will thoroughly mix with carbon passing off from the coal and thoroughly uniting every particle of escapingI carbon, making it instantly combustible. t will be observed that the superheated steam is conducted through the two central hollow bars which are connected by the Y to the pipe B and is then by means of the hollow cross-bar E conveyed to each of the other hollow gratebars that the steam will become more highly heated and that when such superheated steam is thus evenly distributed to all the bars it will be so discharged that the jets coming from the perforations (1 will not hit each other by reason of the staggered relation of the perforations in the adjacent sides of two grate-bars.

Grate-bars made in accordance with my invention will last much longer than solid iron bars, because the steam has a tendency to keep their temperature to that of the superheated steam. Besides, the great volume hexagonal shape with the upper side walls d of air which is drawn in around the gratemade thicker than the lower side walls d, as bars keeps them from burning and warping. shown in Fig. 3. These grate-bars are closed No steam-pressure of importance is had in at their front ends, while they are connected the hollow grate-bars, as it is allowed to 'at their rear ends and communicate with a escape almost as fast as admitted, which is hollow cross-bar E, suitably supported the smallest quantity possible consistent against the bridge-wall of the furnace. The with a thorough and efficient working of central pair of hollow-grate-bars are connectsame. The stop-c0ck b in the pipe may be These perforations with it form a combustible the boiler to the used to control the passage of steam from grate-bars.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a boiler-furnace grate the combination with a series of hollow hexagonal bars, the upper walls of which are relatively thicker than the lower walls, the upper side Walls having diagonal perforations directed upwardly therethrough, each hexagonal hollow bar being closed at the forward end, a hollow cross-bar closed at each end and connecting the rear ends of the hexagonal bars with each other, a pipe connected with the steam-space of the boiler extended into the fire-chamber and coiled around within the same, and a pipe connecting said coil with the central members of the hexagonal hollow bars at their forward ends, whereby steam from the boiler will be superheated before passing to the grate-bars to be discharged through the diagonal perforations, and means for controlling the passage of the steam through said pipe from the steamspace to the grate-bars. I 2. In a boiler-furnace grate the combination with a series of hollow hexagonal bars having thickened upper side walls, said walls I having diagonal perforations extending upl wardly through the same, said hollow bars I having their forward ends closed, a hollow cross-bar connecting the rear ends of said 5 hexagonal bars with each other, a pipe connected at one end with the steamspace of I the boiler passing into the fire-chamber and coiled around'within the same above the K hollow grate-bars, and connected at its other end with the central members of the hollow I hexagonal grate-bars, at or near their forf ward ends, and means for controlling the l passage of the steam through said pipe from i the steam-space to the hollow grate-bars.

PHILIP S. SPILLER.

; Witnesses HERMAN HADDERFELD, 1 WM. H. HUTHER. 

